package com.dfhc.pub.verificationcode;

import java.awt.image.BufferedImage;
import java.io.IOException;

import javax.imageio.ImageIO;
import javax.servlet.ServletConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import com.octo.captcha.service.CaptchaServiceException;
/**
 * 验证图片servlet
 * @author longsebo
 *
 */
public class ImageCaptchaServlet extends HttpServlet {

	/**
	 * 
	 */
	private static final long serialVersionUID = 1L;

	public void init(ServletConfig servletConfig) throws ServletException {
		super.init(servletConfig);
	}

	protected void doGet(HttpServletRequest httpServletRequest,
			HttpServletResponse httpServletResponse) throws ServletException,
			IOException {
		genernateCaptchaImage(httpServletRequest, httpServletResponse);
//		System.out.println("DO GET....");
//		byte[] captchaChallengeAsJpeg = null;
//		// the output stream to render the captcha image as jpeg into
//		ByteArrayOutputStream jpegOutputStream = new ByteArrayOutputStream();
//		try {
//			// get the session id that will identify the generated captcha.
//			// the same id must be used to validate the response, the session id
//			// is a good candidate!
//			String captchaId = httpServletRequest.getSession().getId();
//			// call the ImageCaptchaService getChallenge method
//			BufferedImage challenge = CaptchaServiceSingleton.getInstance()
//					.getImageChallengeForID(captchaId,
//							httpServletRequest.getLocale());
//
//			// a jpeg encoder
//			JPEGImageEncoder jpegEncoder = JPEGCodec
//					.createJPEGEncoder(jpegOutputStream);
//			jpegEncoder.encode(challenge);
//		} catch (IllegalArgumentException e) {
//			httpServletResponse.sendError(HttpServletResponse.SC_NOT_FOUND);
//			return;
//		} catch (CaptchaServiceException e) {
//			httpServletResponse
//					.sendError(HttpServletResponse.SC_INTERNAL_SERVER_ERROR);
//			return;
//		}
//		captchaChallengeAsJpeg = jpegOutputStream.toByteArray();
//		// flush it in the response
//		httpServletResponse.setHeader("Cache-Control", "no-store");
//		httpServletResponse.setHeader("Pragma", "no-cache");
//		httpServletResponse.setDateHeader("Expires", 0);
//		httpServletResponse.setContentType("image/jpeg");
//		ServletOutputStream responseOutputStream = httpServletResponse
//				.getOutputStream();
//		responseOutputStream.write(captchaChallengeAsJpeg);
//		
//		responseOutputStream.flush();
//		responseOutputStream.close();
	}
	
	
	/**
	 * 生成验证码图片
	 */
	private void genernateCaptchaImage(final HttpServletRequest request, final HttpServletResponse response)
			throws IOException {
		response.setHeader("Cache-Control", "no-store");
		response.setHeader("Pragma", "no-cache");
		response.setDateHeader("Expires", 0);
		response.setContentType("image/jpeg");
		ServletOutputStream out = response.getOutputStream();
		try {
			String captchaId = request.getSession(true).getId();
			BufferedImage challenge = (BufferedImage)  CaptchaServiceSingleton.getInstance().getChallengeForID(captchaId, request.getLocale());
			ImageIO.write(challenge, "jpg", out);
			out.flush();
		} catch (CaptchaServiceException e) {
		} finally {
			out.close();
		}
	}
}